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CRISPR Shreds Undruggable Cancer Cells with Precision
When Jingkun Zeng, PhD, joined the lab of Nobel laureate, Jennifer Doudna, PhD, as a postdoctoral researcher in 2024, he was not interested in applying CRISPR for gene editing.
The molecular scissors had demonstrated extraordinary clinical promise in correcting single-point mutations, most strikingly in Baby KJ’s case, where a rare metabolic disorder once presented a 50% mortality rate in infancy.
Yet, Zeng had his ambitious sights on stopping cancer progression, where the biology “became messy.” Cancer can be driven by hundreds of thousands of mutations, making it nearly impossible to correct each mutation one-by-one to restore healthy function.
Zeng, who completed his PhD training in cancer evolution at The Francis Crick Institute, aimed to develop new CRISPR-based technology that could therapeutically access the undruggable tumor suppressor protein, p53. Mutations in this “guardian of the genome” are found in nearly half of all cancers, and up to 70–90% of cases of the most deadly tumors, including ovarian, pancreatic, and non-small cell lung cancer.
In a new study published in Nature titled, “Targeting Cancer-Specific Mutations with RNA-Triggered Chromatin Shredding,” Zeng and colleagues from Innovative Genomics Institute (IGI), University of California (UC) Berkeley, UC San Francisco (UCSF), and Gladstone Institutes, have now engineered a CRISPR system to selectively trigger cancer cell death by chromatin shredding.
The approach recognizes cancer cells using the RNA-guided nuclease, CRISPR-Cas12a2, to recognize mutant p53 mRNA transcripts. Therapeutic effectiveness was demonstrated in mouse models of lung and liver tumors.
Bacterial roots
Mutations in p53 are early drivers in the cancer-causing cascade, making the tumor suppressor one of the most sought-after targets in cancer therapy. Yet despite decades of effort, no approved p53 drugs exist on the market.
Unlike many druggable proteins, p53 lacks a well-defined binding pocket traditionally required by established modalities, such as small molecules or antibodies. Additionally, most cancer therapeutics are designed to inhibit disease-driving proteins, whereas restoring p53 function demands precise, controlled activation of a tumor suppressor.
“It’s the first time we managed to target p53 with such precision,” Zeng told GEN, emphasizing that CRISPR-Cas12a2 can distinguish healthy and disease cells that differed by just one nucleotide.
The novel drug modality takes advantage of CRISPR’s bacterial roots as a defense system that protects against infection by cutting the genetic material of invading viruses, preventing replication and spread.
Zeng also emphasizes that the guide RNA is easily programmable for additional therapeutic areas, such as destroying viral infected cells or abnormal cells due to aging. The technology can also be multiplexed to recognize multiple cancer mutations simultaneously.
The work joins a growing industry effort to develop scalable and generalizable genetic medicines.
Looking ahead, the authors aim to improve the delivery efficiency to cancer cells, a longstanding challenge across CRISPR therapies. The team is also undergoing collaborations to apply the technology across diverse cancer types, including brain, prostate, and ovarian cancer.
The post CRISPR Shreds Undruggable Cancer Cells with Precision appeared first on GEN – Genetic Engineering and Biotechnology News.
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New webinar: Tackling drug discovery challenges in cancer research

Hosted by Drug Discovery World and supported by Sartorius and BioIVT, this webinar will explore the opportunities and challenges that exist within cancer research drug discovery and development.
You will hear from Dr Sudha Rao, Chief Scientific Officer of Kazia Therapeutics, Karol Budzik, PhD, Business Development Associate at Vyriad Therapeutics and Lars van der Veen, Chief Scientific Officer at iOnctura.
Presentations will cover how cancer treatments have shifted towards reprogramming the biology driving tumour growth, immune escape and treatment resistance, the trajectory that in vivo CAR-T treatments are taking, and how challenging tumours burdened by stroma and immune-mediated resistance can be tackled.
Q&A with the speakers follows the presentations.
The post New webinar: Tackling drug discovery challenges in cancer research appeared first on Drug Discovery World (DDW).
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Psilocybin proves promising in neuropathic pain mouse study
Amid the rise of psychedelics in the mental health space, researchers have begun to explore psilocybin as a treatment for chemotherapy-induced peripheral neuropathy.
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New Spectrometry Technique Could Aid Formulation Development
New Spectrometry Technique Could Aid Formulation Development
A new technique combining two forms of spectrometry could help biopharmaceutical companies improve their choice of formulation buffer for antibody manufacturing by revealing how molecular forms and three-dimensional shapes of complex biologics respond to their environment. That’s the view of Christian Bleiholder, PhD, a professor at Florida State University who helped develop the technique.
According to Bleiholder, what happens structurally when a complex biological molecule, such as an antibody or viral spike protein, binds to its target is currently poorly understood.
“This is where [this approach] can help with the bioprocessing and formulation,” he says, as structural changes “can affect the lifespan [of the product] and lead to issues, such as aggregation.”
Because antibodies are complex, existing techniques tend to be powerful at different levels of complexity, he explains. Mass spectrometry is particularly powerful for distinguishing molecular composition, while structural approaches such as X-ray crystallography and cryo-electron microscopy can provide high-resolution structural information.
The challenge is understanding the link between these things within a heterogeneous sample, he says.
To overcome this, Bleiholder and his team worked with Bruker Daltonics to develop Tandem-Trapped Ion Mobility Spectrometry (Tandem-TIMS). This combines tandem ion mobility spectrometry with tandem mass spectrometry to disentangle three overlapping layers of molecular complexity: molecular form, three-dimensional shape, and binding or assembly state, he says.
He explains that, if the proteins have different structures, they can be characterized with tandem ion mobility spectrometry, and then mass spectrometry can be used to look at their molecular forms and binding states.
Going forward, Bleiholder hopes the technique can be used for formulation development but also earlier, during drug discovery of new products, such as multi-specific antibodies, to determine which molecular states are important and how those change when a biologic engages its target. He also plans to look at automating the technique.
Bleiholder spoke about using Tandem-TIMS at the Bioprocessing Summit in Boston earlier this year.
The post New Spectrometry Technique Could Aid Formulation Development appeared first on GEN – Genetic Engineering and Biotechnology News.
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